Telephone set



UNITED STATES PATENT OFFICE.v

RAYMOND R. HERRMANN, OF NEW YORK, N. Y..YSSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE SET.

To al] /c/w/l/ it nzuj/ concern Be it known that l. RAYMOND li. l-l'iiiiu- MANN, a citizen ot the United States, residing at NewYork, in the county ot' Bronx, State ot' New York, have invented certain new and useful Improvements in Telephone Sets, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone sets and more particularly to sets ot' a type which are known as hand sets in which the receiver and transmitter are assembled to form ar unitary structure. ln using a telephone set .and more particularly a hand set, there is a' tendency on the part of the user when receiving telephonie transmission to press the receiver against his ear and also an opposite" tendency while talking to release the pressure ot' the receiver upon his ear.

In accordance with a teature ot' the invention, advantage is taken ot'.this tendency by utilizing the pressure on the receiver when it is pressed Aagainst the ear ot the vuser to bring'about certain circuit changes.

It is an object ot the invention to provide a hand set which is particularly adapted for use in locations where there is considerable extraneous noise, for instance, in situationsV such as are encountered in railway systems. Therefore, in accordance with a related teature of the invention, the circuit changes which are accomplished by the varying pressure on the receiver are utilized to minimize the effect of the transmitter upon the4 re-.

ceiver While telephonie transmission is being received and to also reduce the efhciency of the receiver While the transmitter is being:

used.l More specifically the circuits are switched so that while the transmitter is lin use, a high resistance is 'connected in' series.

' with the receiver, and While the receiver is in use, the transmitter circuit is entirely severed. As a result of this operation external noises which: may affect the transmittei' during the receiving of a message are without effect, as the transmitter circuit is open, and extraneous noises' which may affeet the transmitter while a message is being transmitted through the set. will have a minimum e'ect upon the receiver..

According to a further feature ot the invention, while the effect otl external noises is minimized in the receiver while the transmitter is in use, nevertheless the receiver is maintained in connection with the line so Specification of Letters Patent.

ot the handle 6.

ratei-ifea May 2., 192e.

Application filed March 25, 1918. Serial No. 224.525.

that it' the party to whom a iiiessage is being communicated should desire to interrupt the message. such .f interruption may be .heard at the receiver with sufficient distinctness to call the attention ot' the transmitting party` to the necessity ot' pressing the receiver closer to his ear, which will result in increasing the efficiency ot' the receiver.

T his and other features ot the inventionv ceiver rlhe transmitter Jr is mounted upon 'A an arm 23 which is pivoted at 19 to one end- Also mounted upon the,v

pivot 1S) and free to swing thereon is a lever l0 which extends up through the hollow portion ot the handle (3, passing through the apertures 14 at either endthereof. The transmitter 4 is pivoted to the handle merely tor the purpose ot' permitting adjustment of its position to meet the convenience ot' the user. i

lever 10 upon which itis mounted, is arranged to cooperate with a plurality otcontact springs T, 8 and 9, whichalso coperate with a pair ot' insulated pinspl and 18 se- -cured tothe. inner wall of the handle. `The lever 10 is held in the position shown in the drawing, which is the normal position ofthe apparatus whennot in use,by means of a coil spring 22; The contact-springs 7, 8 and 9 are insulated trom each other and from the lever l() by means of pieces ot insulation indicated at 13. and are secured to the lever 10 by means ot the screws ll andl2. The` 'cord '16. by means ot which the set maybe associated with a telephone line, extends within the handle and includes aplurality ot conductors. These conductors are distributcd to the various contact springs vand to the receive "and transmitter to provide the circuit connections sh'own in Fig. 2. The lever l() carries in its upper and lower portions adjacent to the end ot' the handle theidisks 20 and 21,'wh-ich operate to maintain the-apertures lll at the ends ot' the handle closed The receiver in connection with thevv when the lever 10 is in either position, for the purpose of excluding foreign substances from the handle.

When in-use, the transmitter llis held adjacent the mouth of the user, and the receiver 5 adjacent the ear of the user. If a message is being received, the receiver 5 is pressed closely against the ear and consequentlythe lever 10 is moved relative to the handle portion 6 to compress the spring 22. This movement ofthe lever 10 opens the contact between the lever 1() and the contact springs 8 and 9, and closes the contact between the lever 1() and the contact spring 7. Vhile a message is being transmitted, the pressure on the receiver 5 is released and the lever 10 returns to the position described above.

Referrin now to the circuit diagram shown in ig. 2, the operation may be described, assuming for example, that the user is transmitting a telephonie message out over thetelephone line indicated at 26 and 27. Under these conditions, as the pressure of the receiver 5 upon the ear of the user is relaxed,

the circuit connections are as indicated vin Y Fig. l2, that is, the contact between the lever 10 and contacts 8 and 9 is made. Under these conditions a local circuit is provided for the transmitter, inclu fr lie-s-.cxntacts 8 and 9,

on windingHof/hesi uction coil 25 and the transmitte/Voice currents generated in this local circuit "arerimpressed upon the telephone line through thesecondary of the induction coil 25 and through the contacts@ and 9 and the lever 10. It will be observed that under these conditions, due to the fact that the contact between'the lever 10 and the contact 7 is broken, the receiver 5 is connected to the telephone line 26 and 27 through the resistance 24. This, of course, will lower the eliciency of the receiver so that the user will not be annoyed by hearing his own conversation through the action of the transmitter, and'furthermore, external noises which may Yact uponthe transmitter will only be faintly reproduced in the receiver. On the other hand, the eiciency of the receiver is not decreased to such a Vpoint that should the party to whom a message. is being transmitted desire to interrupt, such interruption will be heard in the receiver. While the interruption may not be distinctly heard in the receiver, it will be heard to a sulicient extent to cause the user to press the receiver 5 against-his ear and consequently by operating, the contagt between thelever 10 and contact 7 shunt the resistance 24.

When receiving almessaga due' to the fact that the receiver 5 rih pessedi'against the ear of tllejusegthe-etact between the lever 10 v"aii'd contacts 8 and 9 is broken and'the contact between the levrsllland contact 7 is made. This connects 'the receiverfrdirectly to the line and opens ,the local circuit of 'the-.

transmitter, bringing about a condition which is conducive to maximum elicien'cy of the receiver.

What is claimed is:

1. A portable telephone set-'comprising a substantially cylindrical frame, an actuating lever pivoted in one end thereof and extending to the other end, a receiver mounted on the free end of said lever, ay transmitter also vsupported by the frame, and contact springs mounted on but insulated from the actuatingv lever and coperating therewith to separately cohtrol the transmitter and receiver circuits.

2. A portable telephone set comprising a substantially cylindrical frame, a switching mechanism mounted' within the frame, an actuating lever pivoted .in one end and extending through the other end thereof, a receiver mounted upon the free end of the lever, and a transmitter supported by the frame, said lever being adapted to coperate with the switching mechanism to sepa- .rately control the transmitter and receiver circuits.

3. A portable telephone set comprising a substantially cylindrical frame, a switching mechanism mounted within the frame, an actuating lever pivoted in one end of the frame and extending through the, other end thereof, a receiver mounted on the free end of saidlever, a transmitter supported by said frame, circuits vfor said receiver and transmitter, said actuating lever having two operative positions, and means for normall maintaining said lever in operative position to coperate with the switching mechanism so as to close the transmitter circuit and decrease the efficiency of the receiver circuit.- A

4. A portable telephone set comprising a substantially cylindrical frame, an actuating lever pivoted in one 'end thereof and extending to the other end, a receiver mounted upon the free end of said lever, mea-ns for rendering the receiver inefficient, a transmitter supported by the frame, circuits for the receiver and transmitter and contact springs mounted within the frame and controlled by the actuating lever Iwhen it is in its normal position to maintain the 115 receiver circuit in its ineficient condition-- and the transmitter clrcult closed and when moved about the pivot point to open the f sociating said 4transmitter and receiver 125 with the telephone line, and switching means controlled by a relative movement of said receiver 4and handle when the receiver is pressed against the vear of the user to"disable`said transmitter circuit.f l

6. A telephone set comprising a receiver and transmitter, a handle portion upon which said receiver is supported so as to be vmovable relative thereto, circuits for associating said transmitter and receiver with tthe telephone line, and switching means controlled by a relative movement of said receiver and handle when the receiver is pressed against the ear ot' the user to disable said transmitter circuit and when the 'pressure on the receiver is relaxed. to de- -crease the efliclency ot the receiver.

the telephone line, and switching means controlled by a relative movement between said handle and receiver When the pressure of the receiver against the ear of the user is increased or relaxed to vary the efficiency of said receiver.

8. A telephone set comprising a transmitter, a receiver,A circuits therefor, means to support said receiver for movement relative to said transmitter and switching means controlled by said'4 relative movement to open and close said transmitter circuit and simultaneously Vary the eliciency of the receiverl circuit,

In zevitness whereof, I hereunto subscribe my name this th day of March A. D., 1918.

RAYMOND R. HERRMANN. 

